Eng-iue-lathe attachmeira



G. E. RUBiNSUN.

ENGINE LATHE ATTACHMENT. `APPucAnoN HLEU AUGJZ. 1913.

2 SHEETS-'SHEET 2.

.l'atented June 17, 1919.

WfT/VESSES 4 TTOR/VEYS Gnoaen nnms nenmson, on rear-frame, onnoon.

' i ENG-INE-LA'I'HE ALT'IE'AOHMEN.

Sp`ecificati on of Letters a'tenlt.

Patmited June 1'7, 1'9159.

Application filed August 27, 1918. Serial Ne 251,651.

To all whom z't may con/:ora

Be` it known that I, (nouon E. Boin'NsoN, a citizien of the UnitedStates, and-a resident of Portland, in the county of Multnomah andStaite of Oregon, liar-e invented certain new and useful Improveinenisin Engine-Lathe Attachments, of which the following is a specifieation.

My invention is an improvement in engine lathe attachments, and has forits object to provide an attachment of ihecharacter speeified especiallyadapted for grinding, regriirding and boring engine cylinders, and Whichmay be adjusted to grind cylindcrs of different diameters.

In the drawings:

Figure 1 is a perspective view of the improvement in use;

Fig. 2 is an end view of the attachment removed;

Fig. 3 is a longitudinal vertical section through the attachmen-t;

Figs. Ll and 5 are sections on the lines 4-4 and 5-5, mspectively, ofFig. 3;

F ig. G is a side view of the conical bearing sleeve for the grindingshaft;

Fig. 7 is a section on the line 7-7 of Fiv. 6.

Tri the present embodimcnt of the invention, the attaclnnent compriscs ashaftV 1 which has secured to one end thereof a grinding wheel 9, andtheshaft is journaled within a casing or sleeve 3. This sleeve at theend remote from the grinding wheel has threaded engagcment with a hub 4on an offset plate 5, which is adjustably connected with a base plate 6in a. manner to be presently described.

The offset. plate and the base plate are recessed on their adjacentfaces, as shown at 7 and 8, respectively, and the end of the shaft leXtends into the recess 7, a shaft 9 Which is a part of the latheextending into the reeess 8, and When the parts are in normal positionthe shafts 1 and 9 are in alinement. Each shaft 1 and 9 has a sp-rocketWheel 10 and 11, respectively, sec-ured to the inner end thereof, andthese sprocket wheels are connected by sprocket chains '12 with sprockctwheels 13 and 14 securcd to a stub shaft 15 Which is connected with bothp-lates 5 and 6. Referring to Fig. 8, it will be noted that the pinions13 and 14 which are integral are mounted upon an eccentric 16 rigid withthe stub shaft 15, a bushing being arranged between the sprocket wheelsand the cccontric, and this shaft 15 is` capable of being rotated Withrespect to the plates 5 and (i, to vary the eecentricity of thecccentric16, to provide a means of tighteuing the sprocket chains 12.

The plate `5 is adjusted With respect to the plate G by means ofajmicrometer adjustinent, the said adjustment consistinff of a thread-edrod V18 which is journalec. in a bearing 19 on the plate G and hasengagement With a nut 20 in the head of a bolt which passes through oneof a series of openings 21 in the plate 5 and through an arc shaped slotin the ,plate (i, and is engaged b i the rod on the oppositc face of theplate G from theiplate 5.

This rod has a handle :23 at its upper' end and a scale, as shown inFig. 2, is provided in connection with the rod for indicating the degreeof variation between the aXos of the shafts 1 and 9.

The plate 0 has a hub portion 2% which, as shown in Fig. 3, is adaptcdto oi igage the face plate 25 of the lathe indicatd at 26, and to beSecured to the face plate by means of -screws V27, as shown. \Vhen soconnected, it willbe Obi'ious that by means of the inicriometer screwadjustment the plates 5 'ah'd (3 may be moved With respect to eachother. to cause the shaft 1 Ito take a position eccentric to the shaft9, so that the said shaft 1 will not only be rotated on its own axisthrough the sprocket wheels 10, 11` 13 and 14 and the chains 12, hut itwill also be given a. bodily movement of revolution around its axis,through the rotation of the plates and G. Thus the cylinders 28 may beexactly ground, reground or bored.

The projcctor or easing 8 has radial openings 29 near the plate 5 forcngagement by a spanner, to turn the said easing When it is desired. Thesaid easing has a spiral groove 30 on its periphery, extending from oneof these recesses to the opposite end, and delivering at the bearing forthe shaft 1 at this end, and within the groove is arranged a tube 31 forcarrying a lubricant.

A bushing` is arranged between the inner end of the shaft 1, the hub ofthe offset plate and the tu'bular casing, as shown in Fig. 3, and theshaft 1 has a collar 33 at the outer end of the bushing. Another collar34 is provided near the outer end of the shaft, and a washer 35 isarranged adjacent to the collar and on the outer side thereof.

It Will be noticed that the bore of the tuhular easing 33 adjacent tothe grinding wheel is flaring and a frusto-wnieal bushing 3G is arrangedin this flaring portion at the outer side of the \vasher 35. Thisbushing, as shown more particularly in Figs. (3 and 7, is provided Withtwo series of longitudinally extending s)lits, the members of one seriesextending roni one end and the members of the other series from theother end, and the members of the series alternate, as shown. Thus aresilient bushing is provided.

A Washer 37 is arranged at the outer large end of the bnshing, and adust cap 38 is threaded on to the casing outside of the washer. Alubricating Chamber is provided in the dust cap, at the outer end of thetubn lar easin and the groove 30 has a passage 39 exten ing into thisChamber. Referring to Fig. 3 it Will be notieed that the shaft 1 issectional, the two `sections. having an interloeking tongue and grooveconnection adjaeent to the collar 33.

A shaft 9 extends through the head stock of the lathe and has a smallpulley attached to the end, \vhieh in turn is eonneeted by a belt lo theeonntershaft extending above the lathe. The surplus oil arcumnlating inthe dust cap 38 is carried away by a second spiral tube 30.

I claim:

1. A lathe attaehinent comprising` a grinding shaft having at one end anoffset plate in Which the grinding shaft is jonrnaled, a base platehavin means for connecting the same With the aoe plate of the lathe, the

copies of this patent may be obtained fur five cents each, by adressingthe offset plate and the base plate hein pivoted eceentrio to thegrinding shaft an the axis of rotation of the base plate, a micrometerscrew adjustment at the other end of the said plates for moving theoffset plate With respect to the base plate, rigidly Connected sproeketwheels at the pivotal connection of the plates, a sproeket wheel on thegrinding shaft, a sproeket Wheel :it the aXis of rotation of the baseplate, chains connecting the respective wheels, an eeeentrie mountingfoi` the rig ;idl iv eonneeted sprocket wheels and adjustable fortensioning the chains, said offset plate and base plate being recssed ontheir adjacent faces to receive the wheels and ehains and to form ahonsing for the said wheels and chains.

2. A lathe attaehment comprising a grinding shaft having at one end anoffset plate in Which the grinding shaft is jonrnaled, a hase platehaving means for connecting the same With the fare plate of the lathe,the offset plate and the base plate being,r pivoted (wflentrie to thegrindinfr shaft and the axisI of roiation of thihase plate, ainieroineter serew adjustment at the other end of the said plates formoving the offset plate With respect to the base plate, rigidlyeonnected sproeket wheels` at the pivolal connection of the plates, acontact wheel on the grinding shaft, a sproeket Wheel at the axis ofrotation of the base plate, chains connecting the respective wheels, aneeeentrie monnting for the rigidly Connected sprocket wheels andadjnstable for tensioning the chains.

GEORGE ELLIS ROBINSON.

Commissoner of atents,

Washington, D. 0.

